Google Inc. is extending a mobile- advertising feature to the desktop, its most significant ad service to debut on smartphones before moving to computers, as the search provider rolls out technology for different platforms.

Sprint Corp. is nearing an agreement on the price, capital structure and termination fee for an acquisition of T-Mobile U.S. Inc. that could value the wireless carrier at almost $40 a share, people with knowledge of the matter said.

Sprint Nextel Corp., whose investors backed a takeover by SoftBank Corp. yesterday after an eight-month fight, is now preparing to use the firepower of its soon- to-be parent company to target Verizon Wireless and AT&T Inc.